<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        for (i = 2; i <= 100; i++) {
            var flag = true
            for (j = 2; j < i; j++) {
                if (i % j == 0) {
                    flag = false
                    break
                }
            }
            if (flag) {
                document.write(i + '是质数' + '<br>')
            }
            // if (!flag) {
            //     document.write(i + '是合数' + '<br>')
            // }
        }
    </script>
</body>

</html>